As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 4145 - AFTER DEPARTURE, RIGHT ENGINE HAD LARGE FLUCTUATIONS IN RPM, EGT AND TORQUE. REDUCED POWER AND ENGINE STABILIZED, RETURNED TO FIELD. CLEANED CANNON PLUGS ON RIGHT ENGINE TORQUE SIGNAL CONDITIONER. GROUND RUN AND OPERATIONAL CHECK OF ENGINE GOOD. AIRCRAFT RETURNED TO SERVICE. (M)